Circuit/System Testing

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: If any DTC's other than DTC P1174 is also set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Inspect the air intake system for the following:
- Modified, damaged, or restricted components
- Dirty or deteriorating air filter element
Test fuel injector balance for a rich or lean condition. Refer to Fuel Injector Diagnosis .
Inspect the base engine for the following:
- The crankcase ventilation system for correct operation-Refer to Crankcase Ventilation System Inspection/Diagnosis .
- A vacuum leak and other un-metered air downstream of the MAF sensor
- The intake manifold for a leak
Inspect the exhaust system for the following:
- An exhaust leak
- Damaged, restricted, modified or enhanced exhaust system-Refer to Symptoms - Engine Exhaust .
Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .